ASCIIMathML is a script that converts
calculator-style ASCII math notation (and many
LaTeX formulas) to Presentation MathML while your
Web page loads. It works with HTML and XHTML files
in Mozilla/Firefox/Netscape 7+ browsers, as well
as in Internet Explorer 6 with MathPlayer. For
example, the solutions for the equation
'ax^2+bx+c=0' are expressed in the HTML file as
'(-b +- sqrt(b^2 - 4ac))/(2a)', and display as
nicely formatted MathML. The script can be easily
used in wikiservers and blogs, as a rudimentary
MathML editor (with instant preview), and to
preview math formulas as they are typed into a Web
page input area.

Aigaion is a Web-based shared bibliography manager
built on PHP/MySQL. It is based on the BibTeX
format, but has support for other formats as well.
Some of its key features are extensive support for
organizing a bibliography in a topic structure,
personal and public annotations on each
publication, multi-user support, easy
import/export, and an intuitive user interface.

Aquamacs is a Mac-like version of the powerful
Emacs text editor that runs as a standard OS X
application. It features extensive customization
that enables it to conform better with Apple's
standard Human Interface Guidelines (HIG) than
standard versions of the editor do. It provides a
more Mac-like user experience than Carbon Emacs.

Asymptote is a powerful descriptive 2D and 3D vector graphics language for technical drawing, inspired by MetaPost but with an improved C++-like syntax. It provides for figures the same high-quality level of typesetting that LaTeX does for scientific text. Asymptote is a programming language as opposed to just a graphics program. It can exploit the best features of script (command-driven) and graphical user interface (GUI) methods. High-level graphics commands are implemented in the language itself, allowing them to be easily tailored to specific applications.

AutoLaTeX is a tool for managing small to large LaTeX documents. It detects which files which are used to build the document (included TeX files, BibTeX, figures, etc.), and launches the various different tools (latex, bibtex, makeindex) when the sources files have been changed. It provides translation rules which automatically generate figures in EPS, PNG, or PDF formats from different types of sources (dia, xfig, svg, astah, source code, etc.) AutoLaTeX also provides graphical user interfaces, a plugin for the editors Gedit and Sublime Text, and a standalone Gtk application.

BHL is an Emacs mode which enables you to convert
plain text files into HTML, LaTeX, Texinfo, SGML
(Linuxdoc), and TXT files. The BHL mode handles
three levels of sections, many sectioning styles,
common font-styles, any kind of lists, tables,
URLs, horizontal rules, and Wiki names. BHL
handles a list of links (lol) and a table of
contents (toc): you can browse the lol and the
toc, insert them where you want, and update the
sections' numbers with one keystroke.